Problems with using Simulink model "ad9361_sim.slx"

I am trying to run Simulink example model "ad9361_sim.slx" with ZedBoard, equipped with AD-FMCOMMS3-EBZ. The signal, captured with RX and displayed at Time Scope looks very strange: nothing similar to a sine tone. Looks like a noise with a periodic bias.

If I generate a sine tone using ADI IIO Osciloscope (One CW Tone) everything is ok. The screenshots of the used settings are given below (they are standard for the model).

For target:

For the Sine generator:

For ad9361 block:

All the latests updates are installed (using update script).

Can you, please, clear up, what the problem is? Thank you very much in advance and looking forward to your help!!!

After looking at your Simulink settings, I found there are two differences between yours and the model from GitHub:

1. In iio_sys_obj, the number of input data channels and number of output data channels is set as 2 in our model, so that we only observe the I&Q of channel 1. It is recommended to have a loopback cable between Tx and Rx of channel 1.

2. In sine wave block, the amplitude is set as 32768. Your amplitude is set as 1, which is much lower than ours.

Can you try these changes and see whether you can get something better?

But the signal in a Scope is quite strange: each quadrature looks like a sum of two sines with frequency 1.5Hz and 3 KHz, while I am expecting to see 100 Hz tone in each quadrature. The captured Scope screen is given below: one in a large scale, and one in a detailed scale (picture in ADI IIO Scope is similar to those).

If I try to generate 2.4 GHz tone (setting frequency in Sine Blocks to zero), the signal in a Scope remains the same.

This signal responses on changing of TX attenuation settings in ADI IIO Scope: if I increase attenuation, signal amplitude decreases.

It seems that you are able to get the sine waves in the scope now, not just some noise as shown in your original post? That is some good progress.

However, I do not quite understand the last two plots you posted. Do you use the same "Time Scope" as in our model. On your first plot, there are I and Q, but on the second plot, there is only I or Q? Can you explain more about the plots and elaborate your questions.

These two pictures show the same curvers but in different scales. I see them in a same Time Scope given in your model. In both pictures there are I signal (yellow) and Q signal (blue). Each of these two signals looks like a sum of two sines.

Since this signal don't depend on settings of Sine Wave blocks, I think that the problem is that the samples don't reach to a target. If I generate file with samples and run it in a "DAC buffer output mode" in ADI IIO Scope everything is ok.

I feel a little confused about the second plot, since the yellow curve and the blue curve have the same phase. In theory, there should be a 90 degree phase difference, given one is from I and the other is from Q.

Anyway, can you please set the "DDS Mode" in IIO Scope to be "Disabled" to see whether it makes any difference?